What
@Patrick said, except I wouldn't say Rush Pond (aka Gurney Lane South) is a loop. There are many really fun fast & flowy professionally built MTB trails all over the park with berms & pump sections & some chunky trails too. Smoother than Gurney since it's newer. Seems like they're adding a new trail every year. There is a gravel road loop that is for hikers or casual bikers (10 mph speed limit).
Both Gurney Lane North & South (aka Rush Pond) are really fun well designed MTB trails.
Plus 2 Saratoga parks (only 15-20 min farther from LG than Gurney):
- Graphite Range which is fast & flowy with decent climbing. Really fun professionally built MTB trails.
- SMBA starting from Daniels Road or Artisan Brewery. Definitely the biggest trail network & most challenging. Rocks & roots all over.
It's much easier starting from Daniels Road vs the brewery. Starting at the brewery is a pretty long steep climb before you get to the goodness.
On the flip side you finish with a pretty awesome descent and a brewery.
I would go to Saratoga before Brant Lake. The initial climb at Brant Lake (Stairway to Heaven) sucks IMO. Steep, loose, muddy. Unless you like that. Once you're at the top it's more fun, but not that many trails.
Be prepared for black flies. I heard they were bad In Lake Placid. Not sure about the southern ADK.